Astronomy:F Hydrae
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Short description: Star in the constellation Hydra
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| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Hydra |
| Right ascension | 08h 43m 40.37345s[1] |
| Declination | −07° 15′ 01.4323″[1] |
| Apparent magnitude (V) | 4.64[2] |
| Characteristics | |
| Spectral type | G1Ib[3] |
| B−V color index | +0.80[2] |
| Astrometry | |
| Radial velocity (Rv) | 28.50[4] km/s |
| Proper motion (μ) | RA: −11.62[1] mas/yr Dec.: −1.36[1] mas/yr |
| Parallax (π) | 4.24 ± 0.17[1] mas |
| Distance | 770 ± 30 ly (236 ± 9 pc) |
| Absolute magnitude (MV) | −2.77[5] |
| Details | |
| Mass | 5.2[3] M☉ |
| Radius | 110[6] R☉ |
| Surface gravity (log g) | 2.08[3] cgs |
| Temperature | 5,370[3] K |
| Metallicity [Fe/H] | −0.01[7] dex |
| Rotational velocity (v sin i) | 10.5[8] km/s |
| Age | 89[3][9] Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
F Hydrae, also known as HD 74395, is a star in the constellation Hydra with an apparent magnitude is 4.64. It was catalogued as 31 Monocerotis, but this name is now rarely used since the star is now within the boundaries of Hydra.[10] It is a low mass yellow supergiant around a thousand times brighter than the sun and five times as massive.
F Hya is a catalogued as a triple star, with 8th magnitude BD-06°2707 80" away and 13th magnitude companion at 57".[11]
References
- ↑ 1.0 1.1 1.2 1.3 1.4 Van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics 474 (2): 653–664. doi:10.1051/0004-6361:20078357. Bibcode: 2007A&A...474..653V.
- ↑ 2.0 2.1 Luck, R. Earle (2014). "Parameters and Abundances in Luminous Stars". The Astronomical Journal 147 (6): 137. doi:10.1088/0004-6256/147/6/137. Bibcode: 2014AJ....147..137L.
- ↑ 3.0 3.1 3.2 3.3 3.4 Lyubimkov, Leonid S.; Lambert, David L.; Korotin, Sergey A.; Rachkovskaya, Tamara M.; Poklad, Dmitry B. (2015). "Carbon abundance and the N/C ratio in atmospheres of A-, F- and G-type supergiants and bright giants". Monthly Notices of the Royal Astronomical Society 446 (4): 3447. doi:10.1093/mnras/stu2299. Bibcode: 2015MNRAS.446.3447L.
- ↑ Gontcharov, G. A. (2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters 32 (11): 759–771. doi:10.1134/S1063773706110065. Bibcode: 2006AstL...32..759G.
- ↑ Kovtyukh, V. V.; Chekhonadskikh, F. A.; Luck, R. E.; Soubiran, C.; Yasinskaya, M. P.; Belik, S. I. (2010). "Accurate luminosities for F-G supergiants from FeII/FeI line depth ratios". Monthly Notices of the Royal Astronomical Society 408 (3): 1568. doi:10.1111/j.1365-2966.2010.17217.x. Bibcode: 2010MNRAS.408.1568K.
- ↑ Pasinetti Fracassini, L. E.; Pastori, L.; Covino, S.; Pozzi, A. (2001). "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS) - Third edition - Comments and statistics". Astronomy and Astrophysics 367 (2): 521. doi:10.1051/0004-6361:20000451. Bibcode: 2001A&A...367..521P.
- ↑ Kovtyukh, V. V.; Gorlova, N. I.; Belik, S. I. (2012). "Accurate luminosities from the oxygen λ7771-4 Å triplet and the fundamental parameters of F-G supergiants". Monthly Notices of the Royal Astronomical Society 423 (4): 3268. doi:10.1111/j.1365-2966.2012.21117.x. Bibcode: 2012MNRAS.423.3268K.
- ↑ Lyubimkov, Leonid S.; Lambert, David L.; Kaminsky, Bogdan M.; Pavlenko, Yakov V.; Poklad, Dmitry B.; Rachkovskaya, Tamara M. (2012). "Lithium abundance in atmospheres of F- and G-type supergiants and bright giants". Monthly Notices of the Royal Astronomical Society 427 (1): 11–26. doi:10.1111/j.1365-2966.2012.21617.x. Bibcode: 2012MNRAS.427...11L.
- ↑ Lyubimkov, Leonid S.; Lambert, David L.; Rostopchin, Sergey I.; Rachkovskaya, Tamara M.; Poklad, Dmitry B. (2010). "Accurate fundamental parameters for A-, F- and G-type Supergiants in the solar neighbourhood". Monthly Notices of the Royal Astronomical Society 402 (2): 1369. doi:10.1111/j.1365-2966.2009.15979.x. Bibcode: 2010MNRAS.402.1369L.
- ↑ 10.0 10.1 Pickering, Edward Charles (1903). "A catalogue of 1520 bright stars". Annals of Harvard College Observatory 48 (4): 125. Bibcode: 1903AnHar..48..125P.
- ↑ Mason, Brian D.; Wycoff, Gary L.; Hartkopf, William I.; Douglass, Geoffrey G.; Worley, Charles E. (2001). "The 2001 US Naval Observatory Double Star CD-ROM. I. The Washington Double Star Catalog". The Astronomical Journal 122 (6): 3466. doi:10.1086/323920. Bibcode: 2001AJ....122.3466M.
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